They are still fairly valuable if you market them correctly. The two generations before me used walnut trees as financial saviors in the 80's and as a means to gather up down payments when expanding farms. As long as you replant them and aren't in a hurry, money really does grow on trees.

yeah, i've thought about selling mine, but i figure when they cut down one walnut, they're going to screw up all the hickories and oaks surrounding them. don't really want to damage the surrounding timber.
sec